Exodus 23:15-17 New American Bible (Revised Edition) (NABRE)
15 You shall keep the feast of Unleavened Bread. As I have commanded you, you must eat unleavened bread for seven days at the appointed time in the month of Abib, for it was then that you came out of Egypt. No one shall appear before me[a] empty-handed. 16 You shall also keep the feast of the grain harvest with the first fruits of the crop that you sow in the field; and finally, the feast of Ingathering at the end of the year, when you collect your produce from the fields. 17 Three times a year shall all your men appear before the Lord God.